Some Factors Affecting Nesting Success of the Bob-white Quail in East-Central Texas

1955 ◽  
Vol 53 (1) ◽  
pp. 45 ◽  
Author(s):  
Paul W. Parmalee
Keyword(s):  
Nesting Success ◽  
East Central ◽  
Factors Affecting ◽  
Central Texas

Influence of Johnsongrass (Sorghum halepense) Density and Period of Competition on Cotton Yield

Weed Science ◽  
1987 ◽  
Vol 35 (1) ◽  
pp. 63-67 ◽  
Author(s):  
David C. Bridges ◽  
James M. Chandler
Keyword(s):  
Yield Loss ◽  
Sorghum Halepense ◽  
Yield Potential ◽  
Yield Response ◽  
Cotton Yield ◽  
Critical Periods ◽  
East Central ◽  
Central Texas ◽  
Competition Period ◽  
Significant Yield

Research was conducted from 1982 through 1984 on a Shipps clay soil (Udic chromustert) in east-central Texas to determine the density-dependent effects and critical periods of johnsongrass [Sorghum halepense(L.) Pers. # SORHA] competition with cotton (Gossypium hirsutumL.). Two experiments were conducted each year, one to assess cotton yield response to increasing johnsongrass density and the second to establish the johnsongrass-free requirement of cotton and the johnsongrass competition period. A critical minimum density of 2 plants/9.8 m of row was observed. Full-season johnsongrass competition densities exceeding 2 plants/9.8 m of row resulted in seed cotton yield reductions each year. Yield decline was most rapid as density increased from 2 to 8 plants/9.8 m of row. Yield loss averaged 1, 4, 14, 40, 65, and 70% for johnsongrass densities of 1, 2, 4, 8, 16, and 32 plants/9.8 m of row, respectively. Percent yield loss was proportional to yield potential at johnsongrass densities of 4 and 8 plants/9.8 m of row. Three to four weeks of rhizome johnsongrass competition or 6 weeks of seedling johnsongrass competition resulted in significant yield reductions. Maintaining cotton johnsongrass free for 4 weeks did not prevent significant yield reductions.

scholarly journals Breeding Biology of Gray-Crowned Tyrannulet in the Monte Desert, Argentina

The Condor ◽  
2000 ◽  
Vol 102 (1) ◽  
pp. 205-210 ◽  
Author(s):  
Eduardo T. Mezquida ◽  
Luis Marone
Keyword(s):  
Incubation Period ◽  
Breeding Season ◽  
Nesting Success ◽  
Nest Failure ◽  
East Central ◽  
Male And Female ◽  
Monte Desert ◽  
Present Information ◽  
Nestling Period ◽  
Wet Tropics

Abstract We present information from 75 nests of Gray-crowned Tyrannulet (Serpophaga griseiceps) found in open Prosopis woodlands of the central Monte desert between 1995 and 1997 and compare it with information corresponding to other species of the genus. Breeding occurred from October to January. Nests are small open cups. Both parents participated in nest building, which lasted 4–7 days. In the Prosopis woodland, 98% of the nests were built in chañar (Geoffroea decorticans), which also is commonly used as a nest plant by S. subcristata in east-central Argentina. Mean clutch size did not vary among years nor within the breeding season, and it was similar to that observed in other Serpophaga. Both male and female shared the 13–15 day incubation period. Hatching was asynchronous. Nestling period lasted 13–14 days, during which both parents reared the chicks. Nesting success (26%) appeared to be less than that previously reported for Nearctic open-nesters (50–60%), and Neotropical open-nesters in dry (50%) and wet tropics (35%). Egg and nestling predation were the main cause of nest failure.

scholarly journals U-Pb detrital zircon geochronology of the Upper Paleocene to Lower Eocene Wilcox Group, east-central Texas

Geosphere ◽  
2016 ◽  
Vol 12 (5) ◽  
pp. 1517-1531 ◽  
Author(s):  
Preston J. Wahl ◽  
Thomas E. Yancey ◽  
Michael C. Pope ◽  
Brent V. Miller ◽  
Walter B. Ayers
Keyword(s):  
Detrital Zircon ◽  
Zircon Geochronology ◽  
Lower Eocene ◽  
East Central ◽  
Detrital Zircon Geochronology ◽  
Central Texas ◽  
Upper Paleocene
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